今天在使用foreach循环遍历list集合时，出现Collection was modified; enumeration operation may not execute.这个错误，查了半天才发现是当想要修改list集合时，不能使用foreach，因为foreach是取只读的，在取的时候数据不能变（包括修改，删除，添加等），所以只能用for循环。
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